News and activity reports about Ruapehu volcano:

Updated: Sep 21, 2021 20:37 GMT

Ruapehu volcano (New Zealand): increased crater lake temerature and seismic activity

Wed, 17 Apr 2019, 22:10
22:10 PM | BY: LEO
The Ruapehu crater lake during winter. (image: GNS Science)
The Ruapehu crater lake during winter. (image: GNS Science)
Another phase of increased crater lake temperatures has been recorded at the Te Wai ā-moe (Crater Lake) Mt Ruapehu in combination with moderate levels of volcanic tremor.

For the last 10 years temperatures of the summit crater lake have cycled between ~15 and 45°C over 12 month periods. Since September 2018 lake temperatures have remained at ~30°C. Over the past two weeks the temperatures have risen again at a rate of 0.5°C per day, to 42°C on April 9. Consistant with previous periods heating cycles a moderate volcanic tremor has accompanied this rise in temperature.

Previously, eruptions have been observed to occur more frequently when the lake temperature exceed 45°C, although this was not the case in 2016 when a temperature of 46°C was observed with no eruption.

Both the Volcanic Alert Level (level 1) and Aviation Code (Green) remain unchanged.

Previous news

Mon, 7 Nov 2016, 15:23
Tremor spectrum and amplitude at Ruapehu volcano (GeoNet)
Volcanic tremor (which is normally present at the volcano) has increased a notch since mid October, but not enough to trigger a raise in alert status of the volcano (which remains at level 1). New Zealand's GNS Science issued a note but does not expect the volcano to erupt soon. ... Read all
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